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Zac Hanson and Wife Kate Expecting Baby No. 5, a Son: 'So Happy and Thankful'

The Hanson family is getting another new member!

Zac Hanson, the youngest brother in the musical group and the band's drummer, and his wife Kate are expecting their fifth child, a son, they reveal exclusively with PEOPLE.

"We're so happy and thankful for the things 2020 got right, especially this little guy coming in March! 💙 Here's to fresh starts and new beginnings," Zac, 35, tells PEOPLE of the pregnancy news.

Zac married his longtime love Kate Tucker in June 2006 after five years of dating. They now share four other children together: Mary Lucille Diana, 4, George Abraham Walker, 7, Junia Rosa Ruth, 10, and John Ira Shepherd, 12.

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This will be the 15th child among the three brothers in the Hanson band, which also includes Taylor, 37, and Isaac, 40. Taylor and wife Natalie, 36, recently welcomed daughter Maybellene Alma Joy on Monday, Dec. 7.

The couple also share daughters Wilhelmina "Willa" Jane, 8, Penelope "Penny" Anne, 15, and sons Claude Indiana Emmanuel, 2, Viggo Moriah, 12, River Samuel, 14, and Jordan Ezra, 18.

Isaac and his wife Nicole have three kids: Nina Odette, 6, James Monroe, 12, and Clarke Everett, 13.

"It's a cool thing," Zac said of their collective kids becoming close over the years, while appearing on the Lorraine talk show in February 2019. "We spend a lot of time together touring, in the studio and around each other, so our kids know each other really, really well. They're really, really close."